When I was sleeping and dreaming, I dreamed that there was a woman in the elevator mirror, but I didn't see it. I went down more than ten floors. Is this a nightmare?

It's good to dream of going up by elevator, but it's still more than ten floors down, which should be very bad. As for whether it is a nightmare or not, if you are not afraid, it should not count. Through this dream, you should review yourself. You should be careful what you have done recently, whether for others or just for yourself. Have some bad habits. Don't think that it's okay not to hurt others or influence others (for example, to stimulate yourself and solve your own physiological needs).